Alright, let's work through 5990 times 3490 step by step
5990 × 3490 = 3490 × (5990)
+ 3490 × 0 that equals 0
+ 3490 × 90 yielding 314100
+ 3490 × 900 which equals 3141000
+ 3490 × 5000 that results in 17450000

= 20905100
